Cagliostro (カリオストロ Kariosutoro) was an alchemist from the top brass of the Bavarian Illuminati. As of Senki Zesshou Symphogear M, she has been revived and turned fully human, unfortunately stripping her of her previous alchemist abilities. As of M, she has become an official protagonists as well as Symphogear User.

Cagliostro used to be a man, but after he met Saint-Germain, his body was biologically altered via alchemy into the perfect form of a "woman". This granted Cagliostro an extended lifespan and permanent youth.

Cagliostro is the user of the Kinkui relic. The relic was originally derived from the Philosopher's Stone, until being formed into a relic of its own and given to her. Unlike Hibiki, Tsubasa, Chris and Kiseki, Cagliostro isn't attuned, meaning she requires the use of LiNKER to keep her powers stable.

Her armed gear take the form of a pair of bronze/gold knuckle braces. They also have the ability to transform into spike/claw-like formations over her fingers.